Results 21 to 30 of about 4,059 (221)

Spectropolarimetry of Comet Halley [PDF]

International Astronomical Union Colloquium, 1991
Abstract Spectropolarimetric observations from 3800 to 7000 Å were obtained for the nucleus of comet Halley for nine nights during 1985-86. The observations were spaced over phase angle of 2 to 66 °. The continuum polarization without molecular-line contamination as well as the polarization of the molecular lines were evaluated.
D. T. Wickramasinghe, N. Visvanathan, Z. Meglick   +2 more
openaire   +2 more sources

Tähistaeval põhinevatest uskumustest III Vana-Hiina [PDF]

Mäetagused, 2002
The article concerns Chinese astral myths, calendar and astrology. Chinese creation myths concern also the creation of the Sun, Moon and stars. The heavenly bodies are constantly endangered by the sky dragon that now and then catches them, probably a ...
Enn Kasak
doaj  

Shocklets in the comet Halley plasma [PDF]

Physics of Plasmas, 2020
Dust acoustic (DA) waves evolving into shocklets are investigated in the comet Halley plasma system relaxing to Maxwellian, Kappa, and Cairns distributions. Here, dynamics of dust is described by the fully nonlinear continuity and momentum equations. A set of two characteristic wave nonlinear equations is obtained and numerically solved to examine the ...
Arshad M. Mirza, Ismat Naeem, Ismat Naeem, Zahida Ehsan, Ghulam Murtaza   +4 more
openaire   +4 more sources

Dating the execution of John the Baptist and the crucifixion of Jesus Christ

RUDN Journal of World History
The study is devoted to clarifying the chronology of such significant events of gospel history as the execution of John the Baptist and the crucifixion of Jesus Christ.
Vladimir O. Nikishin
doaj   +1 more source

The Gold‐Maker of Animal Oil and Prussian Blue Fame — The Chemical and Medicinal Science Philosophy of Johann Conrad Dippel

The Chemical Record, Volume 25, Issue 7, July 2025.
The radical Pietist Johann Conrad Dippel was a self‐proclaimed adept – a maker of gold and the philosophers’ stone. He was also a magister of theology, a doctor of medicine, and a self‐taught chemist, who coinvented the pigment Prussian Blue together with Johann von Diesbach, became known for his animal pyrolysis oil, his wonder‐wound balm, his ...
Curt Wentrup
wiley   +1 more source

Observations of a Disconnection Event and Other Large‐Scale Disturbances in the Ion Tail of Comet C/2022 E3 (ZTF)

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We analyze five large‐scale tail disturbances in comet C/2022 E3 (ZTF)'s ion tail using images from astrophotographers, tracking specific features within the tail to determine their speeds. We employ a heliosphere model to estimate when the comet crossed the heliospheric current sheet (HCS).
A. Wellbrock, G. H. Jones
wiley   +1 more source

Helium in Mercury's Extended Exosphere Determined by Pick‐Up Generated Ion Cyclotron Waves

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract Helium (He) was first detected by remote spectroscopic observations of the Ultraviolet Visible Spectrometers (UVVS) instrument in Mercury's exosphere during the three Mariner 10 flybys in 1974 and 1975. Here, we derive the first in situ radial density profile of He in Mercury's extended exosphere by analyzing magnetic field and plasma ...
F. Weichbold, H. Lammer, D. Schmid, M. Volwerk, J. Hener, A. Varsani, A. Vorburger, P. Wurz, C. Simon‐Wedlund   +8 more
wiley   +1 more source

Ion‐Scale Characteristics of the Martian Magnetic Pile‐Up Boundary Layer

Geophysical Research Letters, Volume 52, Issue 3, 16 February 2025.
Abstract The Martian magnetic pile‐up boundary (MPB) delineates the interface between the magnetosheath and the induced magnetosphere, but its global ion‐scale characteristics remaining unclear. Utilizing a three‐dimensional Hall magnetohydrodynamic (MHD) model, this study aims to reveal the features of the MPB layer, including magnetic field, current ...
Shibang Li, Siqi Wang, Haoyu Lu, Jinbin Cao, Xiaoshu Wu, Yasong Ge, James A. Wild, Chuanfei Dong, Nihan Chen, Yihui Song, Jianxuan Wang, Yuchen Cao, Jianing Zhao   +12 more
wiley   +1 more source

Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars

Journal of Geophysical Research: Atmospheres, Volume 129, Issue 21, 16 November 2024.
Abstract Meteoroids of sub‐milligram sizes burn up high in the Earth's atmosphere and cause streaks of plasma trails detectable by meteor radars. The altitude at which these trails, or meteors, form depends on a number of factors including atmospheric density and the astronomical source populations from which these meteoroids originate.
E. C. M. Dawkins, D. Janches, G. Stober, J. D. Carrillo‐Sánchez, R. S. Lieberman, C. Jacobi, T. Moffat‐Griffin, N. J. Mitchell, N. Cobbett, P. P. Batista, V. F. Andrioli, R. A. Buriti, D. J. Murphy, J. Kero, N. Gulbrandsen, M. Tsutsumi, A. Kozlovsky, M. Lester, J.‐H. Kim, C. Lee, A. Liu, B. Fuller, D. O’Connor, S. E. Palo, M. J. Taylor, J. Marino, N. Rainville   +26 more
wiley   +1 more source

Waves and Instabilities in Saturn's Magnetosheath: 2. Dispersion Relation Analysis

Journal of Geophysical Research: Space Physics, Volume 129, Issue 10, October 2024.
Abstract The WHAMP (Rönnmark, 1982, https://inis.iaea.org/search/search.aspx?orig_q=RN:14744092) and LEOPARD (Astfalk & Jenko, 2017, https://doi.org/10.1002/2016ja023522) dispersion relation solvers were used to evaluate the growth rate and scale size for mirror mode (MM) and ion cyclotron (IC) instabilities under plasma conditions resembling Saturn's ...
I. Cheng, N. Achilleos, X. Blanco‐Cano, C. Bertucci, P. Guio   +4 more
wiley   +1 more source